{"cve":"CVE-2026-115389","nvd":{"published":"2026-10-22T19:17:46.330","modified":"2026-10-22T19:17:46.453","status":"Deferred","description":"Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not adequately account for host allocations when lifting guest values through the dynamically-typed Val API, bypassing the hostcall fuel limit. A malicious WebAssembly guest can return crafted values that allocate at least ~100x more host memory than tracked, causing denial of service.","cvss_v4":{"vector":"CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","score":1.0},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L","score":2.3},"cwes":["CWE-770"],"references":["https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-jqpg-j7w6-42pr","https://www.vulncheck.com/advisories/wasmtime-before-36.0.16-37.0.0-before-48.0.3-and-49.0.0-before-49.0.1-denial-of-service-via-val-api"],"products":[],"source":"nvd","synced_at":"2026-10-23T16:39:28.036610720+00:00"},"epss":{"cve":"CVE-2026-115389","score":0.00153,"percentile":0.04355,"date":"2026-10-25"},"kev":null,"osv":[{"id":"RUSTSEC-2026-0316","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0316","summary":"Dynamic record lifting can allocate beyond the hostcall fuel limit","modified":"2026-10-24T06:25:41Z","packages":[{"ecosystem":"crates.io","name":"wasmtime","purl":"pkg:cargo/wasmtime","ranges":[">=0.0.0-0 <36.0.16",">=37.0.0 <48.0.3",">=49.0.0 <49.0.1"],"fixed":["36.0.16","48.0.3","49.0.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}